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wsproxy: Perl Web Proxy

by strredwolf (Chaplain)
on May 20, 2000 at 22:58 UTC ( #13927=sourcecode: print w/replies, xml ) Need Help??
Category: Web Servers
Author/Contact Info strredwolf aka Kelly Price (tygris+perl at
Description: wsproxy is a web proxy in perl! It has filtering and caching abilities, but you need to tell it what to ban or save. It works very well with netpipes, or even inetd!

To use it, try faucet 8080 -io

v0.4 and 0.5 added banning of Javascript and HTML pages.
v0.6 had a file locking bug nuked and preliminiary tempcache support
v0.7 now has an embedded gif (here) v0.8 now has mostly functional (self-cleaning) tempcache support.

### WSproxy v0.8
### By Kelly "STrRedWolf" Price

### A "Tell it to" filter/cache web proxy.  Use it with inetd or netpi

### Configuration

## URL Grep lists.  Use a regexp to match on URL (no need for http://)

# Banned sites.  Examples of ad sites below.


# Cached sites.  If it doesn't match nocache, and matches cached, it'l
# save any matched URL.



      "velar\.ctrl-c\.liu\.se/vcl/Artists/New/.thumbnail/" => 3,
      "g\.akamai\.net/" => 1,
      "\.akamai\.net/.*/i/" => 1,
      "yerf\.com/[^/]+/data/.*\.(gif|jpg|png)" => 2,
      "\.keen(spot|space)\.com/images/" => 2,
      "www.\(superosity|brunothebandit)\.com/.*\.gif" => 3,
      "www\.keenspace\.com/forums/.*\.gif" => 3,
      "amtrak\.com/images/" => 3,

# Where to put our info.  It'll put the files under this directory.
# The URL (w/o http://) will serve as a directory for this.
# The cache will be put here under $info/cache
# a delay db will be put here too.

# Wait time in seconds for a lock to die.
$deadlock=120; # two minutes

### Code!
$ourver="0.8 beta - filtering/caching";
$d=$hard=$help=$log=$v=0;  #debug

foreach $j (@ARGV)
    $d++ if($j eq "-d");
    $v++ if($j eq "-v");
    $hard++ if($j eq "-a");
    $help++ if($j eq "-h");
    $log++ if($j eq "-l");
    $rand++ if($j eq "-f");
    $limit++ if($j eq "-r");
    $cflush++ if($j eq "-c");

    print STDERR <<EOF;
$0 options:
    -d  debug
    -v  verbose
    -a  hard fail on banned URLs
    -l  log interaction
    -f  futz around with pulling images a bit
    -r  try to rate limit (not implemented)
    -c  Flush the TempCache and exit.
    exit 1;

sub flushcache
    # Find files...
    @d=(); $i=0;
    open(IN,"find $info/pcache/. -type f -print |") || die "Find died:
+ $!";
    chop; $f=$_; $a=-M $f;
    foreach $j (keys %pcached)
        $d[$i++]=$f if($f =~ /$j/ && $a > $pcached{$j});
    foreach $j (@d)
    print "Deleting $j\n" if($d); 
    unlink $j;

    # Clean out empty directories.
    @d=(); $i=0;
    open(IN,"find $info/pcache/. -type d -a -empty -print |") || die "
+Find died: $!";
        chop; $d[$i++]=$_;
    foreach $j (@d)
        print "Flushing $j\n" if($d);
        rmdir $j;
    system "touch $info/pcache/stamp";
    exit 0;
&flushcache if($cflush);

# The other end.  Clear any cache when it's due.
$pcf=-M "$info/pcache/stamp";

if($pcf >= 1)
    print STDERR "$$: Forking a flush...\n" if($v);

    exec "$0 -c";

# Requirements
use Socket;

# Error subroutine.  If we run into trouble, we do it here.
sub err {
    my ($e,$r)=@_;    

    # Quickly suck in some junk just in case...
    # BUG:  It just delays netscape somehow.
        # while(<>) {;}
    print STDERR "$$: $e -- $r\n" if($v);

    print "HTTP/1.0 $e\r\n";
    print "Content-Type: text/html\r\n";
    print "Connection: close\r\n\r\n";
    print "<html><head><title>$e</title></head><body>\r\n";
    print "<h1>$e</h1><BR><P>";
    print "WSProxy cannot fulfill your request -- $r<P>$req<P>\n";
    print "<hr><br><i>WSProxy version $ourver<br></I>\r\n";
    exit 0;


sub nothing {
    print STDERR "$$: Sending nothing\n" if($v);

    print "HTTP/1.0 200 OK\r\n";
    print "Content-Type: text/html\r\n";
    print "Connection: close\r\n\r\n";
    print "// Nothing. \r\n";
    print "\r\n";
    exit 0;

sub blank {
    print STDERR "$$: Sending blank\n" if($v);

    print "HTTP/1.0 200 OK\nConnection: close\n";
    print "Content-type: image/gif\n\n",
        pack "H*", "47494638396101000100800000ffffff" .
            "00000021f90401000000002c00000000" .

# Generic file send routine.
sub sendthis {
    my ($file)=@_;
    my ($type);

    $type="image/gif" if /\.gif$/ ;
    $type="image/jpg" if /\.jpg$/ ;
    $type="image/png" if /\.png$/ ;

    while( -e "$file.LOCK" )
    unlink "$file.LOCK" if(-M "$file.LOCK" > $deadlink);
    sleep 3;

    open(IN,"<$file") || &err("500 Internal Server Error","Cannot open
+ cached file ($!)");

    print STDERR "$$: sending $file\n" if($v);
    print "HTTP/1.0 200 OK\r\n";
    print "Content-Type: $type\r\n";
    print "Connection: close\r\n\r\n";
    exit 0;

# Open up a logfile.
    $log='' unless(open(LOG,">/tmp/wsproxy.$$"));

# Read the first line of the request and pharze it.
$_=$req=<STDIN>; tr/\n\r//d;
exit 0 if(/^$/);

m#^(GET|POST|HEAD) http://([^/]+)(/.*) (HTTP\S+)$#i;
$type=$1; $site=$2; $page=$3; $ver=$4;

print LOG "> $req" if($log);


#search banned
foreach $j (@adban)
    if($url =~ /$j/)
    &err("400 Bad Request","Site $site is banned.") if($hard);
    print STDERR "$$: $url banned.\n";

foreach $j (@jsban)
    if($url =~ /$j/)
    &err("400 Bad Request","Site $site is banned.") if($hard);
    print STDERR "$$: $url banned.\n";

#search cached
unless($url =~ /\?/)
    foreach $j (@nocache)
    $really++ if($url =~ /$j/);
    # Peramently cache?
    foreach $j (@cached)
        if($url =~ /$j/)
        &sendthis($file) if (-e $file && -s $file);
        print STDERR "$$: Caching $url\n" if($v);

    # Temp cache.
        foreach $j (keys (%pcached))
        next if($url !~/$j/);
        next unless($pcached{$j});

        $s=-s $file;
        $m=-M $file;
        if($s && $m < 3) {
        unlink $file if($s);
        print STDERR "$$: TempCaching $url\n" if($v);

print STDERR "$$: pulling $url\n" if($v);

if($site =~ /^([^:]+):(\d+)$/)
    $remote=$1; $port=$2;
} else {
    $remote=$site; $port=80;

# Futz around if it's a graphic file.  One attempt to limit Netscape's
+ spammish
# tendencies
if($rand && $page =~ /\.(gif|jpg|png)$/i && !$cachethis)
    print STDERR "$$: Delaying...\n";
    sleep (int (rand 2) + 1);

# Call out and strangle someone
$iaddr   = inet_aton($remote) ;
# print STDERR "$$:  $remote -> $iaddr\n" if($v);
&err("400 Bad Request","Site $remote can't be resolved ($!).")
$paddr   = sockaddr_in($port, $iaddr);

$proto   = getprotobyname('tcp');
socket(SOCK, PF_INET, SOCK_STREAM, $proto)  || &err("500 Internal Serv
+er Error","Something went wrong trying to connect to $remote ($!).");
connect(SOCK, $paddr)    || &err("500 Internal Server Error","Cannot c
+onnect to $remote ($!)");

$old=select(SOCK); $|=1; select($old);

print SOCK "$type $page $ver\r\n"; # Xmission's webserver is funky

    $lo=2 if(/^$/);
    $cont=$1 if(/^Content-[lL]ength: (\d+)$/);
    $nocache++ if(/^Pragma: no-cache/);
    $ok=0 if(/^Proxy-Connection:/);
    print SOCK "Connection: close$l" if($lo);
    print SOCK "$l" if($ok);
    print STDERR "$$ >>> $l" if($ok && $d);
    print LOG "> $l" if($ok && $log);
    last if($lo);

    $in=read STDIN, $buf, ($cont < 256 ? $cont : 256 );
    $cont -= $in;
    print SOCK $buf;
    print STDERR "$$ >>> $buf" if($d);
    print LOG "> $buf\n" if($log);
print STDERR "$$ XXX\n" if($d);

$conn=0; $lc=0;
#    print STDERR "$$: Site went bang: $!\n" if($!);

    $l=$_; $lc++;
    last if(/^$/);
    $conn++ if(/^Connection:/);
    $cont=$1 if(/^Content-[lL]ength: (\d+)$/);
    print $l;
#    print STDERR "$$: Client went bang: $!\n" if($!);
    print STDERR "$$ << $l" if($d);
    print LOG "< $l" if($log);

&err("500 Internal Server Error","Blank document returned.  ($!)")

print "Connection: close\r\n" unless($conn);
print $l;

    $file=~m#^(.*/)[^/]+$#; $dir=$1;

    print STDERR "$$: Saving $url\n" if($v);

    if(! -e $dir)
    system "mkdir -p $dir";
    while(-e "$file.LOCK")
    # Hmmm... already being pulled.
        unlink "$file.LOCK" if(-M "$file.LOCK" > $deadlink);
    sleep 3;


    print OUT "$$\n";
    $cachethis=0 unless( open(OUT,">$file") );
    unlink "$file.lock" unless($cachethis);

    $in=read SOCK, $buf, ($cont < 256 ? $cont : 256 );
    $cont -= $in;
    print $buf;
    print OUT $buf if($cachethis);
    # print STDERR "$$ << $buf" if($d);
    print LOG "< $buf\n" if($log);
} else {
    print OUT if($cachethis);
    print LOG if($log);

unlink "$file.LOCK" if($cachethis);
print STDERR "$$: Done with $url\n" if($v);

Replies are listed 'Best First'.
RE: wsproxy: Perl Web Proxy
by strredwolf (Chaplain) on May 23, 2000 at 06:29 UTC
    I just found out a few nice items relating to some websites and Content-Length. Lovely. Fixed along with the cache locking. Probably needs some cleanup. Anyone know of a good proxy benchmarker?

    -- Perl is intergalactic! WolfSkunks use it!

      hey, how do you install this? do you just copy the code into a .pl document and run it? and does it run like cgiproxy?
        If you read the documentation up top, you'll see that you'll need to grab netpipes to use it. You can also use inetd, socat, netcat, etc.


RE: wsproxy: Perl Web Proxy
by Aighearach on May 21, 2000 at 22:53 UTC
    Very nice! Do you have any benchmarks on it?
    Paris Sinclair    |    4a75737420416e6f74686572    |    205065726c204861636b6572
    I wear my Geek Code on my finger.
      Nothing yet, but I just realized there's a small bug that I can fix with some locking code. The code should be updated now... -- Perl is intergalactic! WolfSkunks use it!
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